FFmpeg: libavfilter/graphparser.c Source File

FFmpeg

[フレーム]

libavfilter

graphparser.c

Go to the documentation of this file.

1 /*

2 * filter graph parser

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg is free software; you can redistribute it and/or

9 * modify it under the terms of the GNU Lesser General Public

10 * License as published by the Free Software Foundation; either

11 * version 2.1 of the License, or (at your option) any later version.

12 *

13 * FFmpeg is distributed in the hope that it will be useful,

14 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

16 * Lesser General Public License for more details.

17 *

18 * You should have received a copy of the GNU Lesser General Public

19 * License along with FFmpeg; if not, write to the Free Software

20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

21 */

23 #include <string.h>

24 #include <stdio.h>

26 #include "libavutil/avstring.h"

27 #include "libavutil/mem.h"

28 #include "avfilter.h"

30 #define WHITESPACES " \n\t"

32 /**

33 * Link two filters together.

34 *

35 * @see avfilter_link()

36 */

37 static int link_filter(AVFilterContext *src, int srcpad,

38 AVFilterContext *dst, int dstpad,

39 void *log_ctx)

40 {

41 int ret;

42 if ((ret = avfilter_link(src, srcpad, dst, dstpad))) {

43 av_log(log_ctx, AV_LOG_ERROR,

44 "Cannot create the link %s:%d -> %s:%d\n",

45 src->filter->name, srcpad, dst->filter->name, dstpad);

46 return ret;

47 }

49 return 0;

50 }

52 /**

53 * Parse the name of a link, which has the format "[linkname]".

54 *

55 * @return a pointer (that need to be freed after use) to the name

56 * between parenthesis

57 */

58 static char *parse_link_name(const char **buf, void *log_ctx)

59 {

60 const char *start = *buf;

61 char *name;

62 (*buf)++;

64 name = av_get_token(buf, "]");

65 if (!name)

66 goto fail;

68 if (!name[0]) {

69 av_log(log_ctx, AV_LOG_ERROR,

70 "Bad (empty?) label found in the following: \"%s\".\n", start);

71 goto fail;

72 }

74 if (*(*buf)++ != ']') {

75 av_log(log_ctx, AV_LOG_ERROR,

76 "Mismatched '[' found in the following: \"%s\".\n", start);

77 fail:

78 av_freep(&name);

79 }

81 return name;

82 }

84 /**

85 * Create an instance of a filter, initialize and insert it in the

86 * filtergraph in *ctx.

87 *

88 * @param filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise.

89 * @param ctx the filtergraph context

90 * @param index an index which is supposed to be unique for each filter instance added to the filtergraph

91 * @param filt_name the name of the filter to create

92 * @param args the arguments provided to the filter during its initialization

93 * @param log_ctx the log context to use

94 * @return >= 0 in case of success, a negative AVERROR code otherwise

95 */

96 static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index,

97 const char *filt_name, const char *args, void *log_ctx)

98 {

99 AVFilter *filt;

100 char inst_name[30];

101 char *tmp_args = NULL;

102 int ret;

103

104 snprintf(inst_name, sizeof(inst_name), "Parsed_%s_%d", filt_name, index);

105

106 filt = avfilter_get_by_name(filt_name);

107

108 if (!filt) {

109 av_log(log_ctx, AV_LOG_ERROR,

110 "No such filter: '%s'\n", filt_name);

111 return AVERROR(EINVAL);

112 }

113

114 *filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);

115 if (!*filt_ctx) {

116 av_log(log_ctx, AV_LOG_ERROR,

117 "Error creating filter '%s'\n", filt_name);

118 return AVERROR(ENOMEM);

119 }

120

121 if (!strcmp(filt_name, "scale") && (!args || !strstr(args, "flags")) &&

122 ctx->scale_sws_opts) {

123 if (args) {

124 tmp_args = av_asprintf("%s:%s",

125 args, ctx->scale_sws_opts);

126 if (!tmp_args)

127 return AVERROR(ENOMEM);

128 args = tmp_args;

129 } else

130 args = ctx->scale_sws_opts;

131 }

132

133 ret = avfilter_init_str(*filt_ctx, args);

134 if (ret < 0) {

135 av_log(log_ctx, AV_LOG_ERROR,

136 "Error initializing filter '%s'", filt_name);

137 if (args)

138 av_log(log_ctx, AV_LOG_ERROR, " with args '%s'", args);

139 av_log(log_ctx, AV_LOG_ERROR, "\n");

140 avfilter_free(*filt_ctx);

141 *filt_ctx = NULL;

142 }

143

144 av_free(tmp_args);

145 return ret;

146 }

147

148 /**

149 * Parse a string of the form FILTER_NAME[=PARAMS], and create a

150 * corresponding filter instance which is added to graph with

151 * create_filter().

152 *

153 * @param filt_ctx Pointer that is set to the created and configured filter

154 * context on success, set to NULL on failure.

155 * @param filt_ctx put here a pointer to the created filter context on

156 * success, NULL otherwise

157 * @param buf pointer to the buffer to parse, *buf will be updated to

158 * point to the char next after the parsed string

159 * @param index an index which is assigned to the created filter

160 * instance, and which is supposed to be unique for each filter

161 * instance added to the filtergraph

162 * @return >= 0 in case of success, a negative AVERROR code otherwise

163 */

164 static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph,

165 int index, void *log_ctx)

166 {

167 char *opts = NULL;

168 char *name = av_get_token(buf, "=,;[\n");

169 int ret;

170

171 if (**buf == '=') {

172 (*buf)++;

173 opts = av_get_token(buf, "[],;\n");

174 }

175

176 ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx);

177 av_free(name);

178 av_free(opts);

179 return ret;

180 }

181

182 AVFilterInOut *avfilter_inout_alloc(void)

183 {

184 return av_mallocz(sizeof(AVFilterInOut));

185 }

186

187 void avfilter_inout_free(AVFilterInOut **inout)

188 {

189 while (*inout) {

190 AVFilterInOut *next = (*inout)->next;

191 av_freep(&(*inout)->name);

192 av_freep(inout);

193 *inout = next;

194 }

195 }

196

197 static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)

198 {

199 AVFilterInOut *ret;

200

201 while (*links && (!(*links)->name || strcmp((*links)->name, label)))

202 links = &((*links)->next);

203

204 ret = *links;

205

206 if (ret) {

207 *links = ret->next;

208 ret->next = NULL;

209 }

210

211 return ret;

212 }

213

214 static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)

215 {

216 element->next = *inouts;

217 *inouts = element;

218 }

219

220 static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)

221 {

222 while (*inouts && (*inouts)->next)

223 inouts = &((*inouts)->next);

224

225 if (!*inouts)

226 *inouts = *element;

227 else

228 (*inouts)->next = *element;

229 *element = NULL;

230 }

231

232 static int link_filter_inouts(AVFilterContext *filt_ctx,

233 AVFilterInOut **curr_inputs,

234 AVFilterInOut **open_inputs, void *log_ctx)

235 {

236 int pad, ret;

237

238 for (pad = 0; pad < filt_ctx->nb_inputs; pad++) {

239 AVFilterInOut *p = *curr_inputs;

240

241 if (p) {

242 *curr_inputs = (*curr_inputs)->next;

243 p->next = NULL;

244 } else if (!(p = av_mallocz(sizeof(*p))))

245 return AVERROR(ENOMEM);

246

247 if (p->filter_ctx) {

248 ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx);

249 av_freep(&p->name);

250 av_freep(&p);

251 if (ret < 0)

252 return ret;

253 } else {

254 p->filter_ctx = filt_ctx;

255 p->pad_idx = pad;

256 append_inout(open_inputs, &p);

257 }

258 }

259

260 if (*curr_inputs) {

261 av_log(log_ctx, AV_LOG_ERROR,

262 "Too many inputs specified for the \"%s\" filter.\n",

263 filt_ctx->filter->name);

264 return AVERROR(EINVAL);

265 }

266

267 pad = filt_ctx->nb_outputs;

268 while (pad--) {

269 AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));

270 if (!currlinkn)

271 return AVERROR(ENOMEM);

272 currlinkn->filter_ctx = filt_ctx;

273 currlinkn->pad_idx = pad;

274 insert_inout(curr_inputs, currlinkn);

275 }

276

277 return 0;

278 }

279

280 static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,

281 AVFilterInOut **open_outputs, void *log_ctx)

282 {

283 AVFilterInOut *parsed_inputs = NULL;

284 int pad = 0;

285

286 while (**buf == '[') {

287 char *name = parse_link_name(buf, log_ctx);

288 AVFilterInOut *match;

289

290 if (!name)

291 return AVERROR(EINVAL);

292

293 /* First check if the label is not in the open_outputs list */

294 match = extract_inout(name, open_outputs);

295

296 if (match) {

297 av_free(name);

298 } else {

299 /* Not in the list, so add it as an input */

300 if (!(match = av_mallocz(sizeof(AVFilterInOut)))) {

301 av_free(name);

302 return AVERROR(ENOMEM);

303 }

304 match->name = name;

305 match->pad_idx = pad;

306 }

307

308 append_inout(&parsed_inputs, &match);

309

310 *buf += strspn(*buf, WHITESPACES);

311 pad++;

312 }

313

314 append_inout(&parsed_inputs, curr_inputs);

315 *curr_inputs = parsed_inputs;

316

317 return pad;

318 }

319

320 static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,

321 AVFilterInOut **open_inputs,

322 AVFilterInOut **open_outputs, void *log_ctx)

323 {

324 int ret, pad = 0;

325

326 while (**buf == '[') {

327 char *name = parse_link_name(buf, log_ctx);

328 AVFilterInOut *match;

329

330 AVFilterInOut *input = *curr_inputs;

331

332 if (!name)

333 return AVERROR(EINVAL);

334

335 if (!input) {

336 av_log(log_ctx, AV_LOG_ERROR,

337 "No output pad can be associated to link label '%s'.\n", name);

338 av_free(name);

339 return AVERROR(EINVAL);

340 }

341 *curr_inputs = (*curr_inputs)->next;

342

343 /* First check if the label is not in the open_inputs list */

344 match = extract_inout(name, open_inputs);

345

346 if (match) {

347 if ((ret = link_filter(input->filter_ctx, input->pad_idx,

348 match->filter_ctx, match->pad_idx, log_ctx)) < 0) {

349 av_free(name);

350 return ret;

351 }

352 av_freep(&match->name);

353 av_freep(&name);

354 av_freep(&match);

355 av_freep(&input);

356 } else {

357 /* Not in the list, so add the first input as a open_output */

358 input->name = name;

359 insert_inout(open_outputs, input);

360 }

361 *buf += strspn(*buf, WHITESPACES);

362 pad++;

363 }

364

365 return pad;

366 }

367

368 static int parse_sws_flags(const char **buf, AVFilterGraph *graph)

369 {

370 char *p = strchr(*buf, ';');

371

372 if (strncmp(*buf, "sws_flags=", 10))

373 return 0;

374

375 if (!p) {

376 av_log(graph, AV_LOG_ERROR, "sws_flags not terminated with ';'.\n");

377 return AVERROR(EINVAL);

378 }

379

380 *buf += 4; // keep the 'flags=' part

381

382 av_freep(&graph->scale_sws_opts);

383 if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1)))

384 return AVERROR(ENOMEM);

385 av_strlcpy(graph->scale_sws_opts, *buf, p - *buf + 1);

386

387 *buf = p + 1;

388 return 0;

389 }

390

391 int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,

392 AVFilterInOut **inputs,

393 AVFilterInOut **outputs)

394 {

395 int index = 0, ret = 0;

396 char chr = 0;

397

398 AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL;

399

400 filters += strspn(filters, WHITESPACES);

401

402 if ((ret = parse_sws_flags(&filters, graph)) < 0)

403 goto fail;

404

405 do {

406 AVFilterContext *filter;

407 filters += strspn(filters, WHITESPACES);

408

409 if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0)

410 goto end;

411 if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0)

412 goto end;

413

414

415 if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0)

416 goto end;

417

418 if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,

419 graph)) < 0)

420 goto end;

421

422 filters += strspn(filters, WHITESPACES);

423 chr = *filters++;

424

425 if (chr == ';' && curr_inputs)

426 append_inout(&open_outputs, &curr_inputs);

427 index++;

428 } while (chr == ',' || chr == ';');

429

430 if (chr) {

431 av_log(graph, AV_LOG_ERROR,

432 "Unable to parse graph description substring: \"%s\"\n",

433 filters - 1);

434 ret = AVERROR(EINVAL);

435 goto end;

436 }

437

438 append_inout(&open_outputs, &curr_inputs);

439

440

441 *inputs = open_inputs;

442 *outputs = open_outputs;

443 return 0;

444

445 fail:end:

446 while (graph->nb_filters)

447 avfilter_free(graph->filters[0]);

448 av_freep(&graph->filters);

449 avfilter_inout_free(&open_inputs);

450 avfilter_inout_free(&open_outputs);

451 avfilter_inout_free(&curr_inputs);

452

453 *inputs = NULL;

454 *outputs = NULL;

455

456 return ret;

457 }

458

459 int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,

460 AVFilterInOut *open_inputs,

461 AVFilterInOut *open_outputs, void *log_ctx)

462 {

463 int ret;

464 AVFilterInOut *cur, *match, *inputs = NULL, *outputs = NULL;

465

466 if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0)

467 goto fail;

468

469 /* First input can be omitted if it is "[in]" */

470 if (inputs && !inputs->name)

471 inputs->name = av_strdup("in");

472 for (cur = inputs; cur; cur = cur->next) {

473 if (!cur->name) {

474 av_log(log_ctx, AV_LOG_ERROR,

475 "Not enough inputs specified for the \"%s\" filter.\n",

476 cur->filter_ctx->filter->name);

477 ret = AVERROR(EINVAL);

478 goto fail;

479 }

480 if (!(match = extract_inout(cur->name, &open_outputs)))

481 continue;

482 ret = avfilter_link(match->filter_ctx, match->pad_idx,

483 cur->filter_ctx, cur->pad_idx);

484 avfilter_inout_free(&match);

485 if (ret < 0)

486 goto fail;

487 }

488

489 /* Last output can be omitted if it is "[out]" */

490 if (outputs && !outputs->name)

491 outputs->name = av_strdup("out");

492 for (cur = outputs; cur; cur = cur->next) {

493 if (!cur->name) {

494 av_log(log_ctx, AV_LOG_ERROR,

495 "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",

496 filters);

497 ret = AVERROR(EINVAL);

498 goto fail;

499 }

500 if (!(match = extract_inout(cur->name, &open_inputs)))

501 continue;

502 ret = avfilter_link(cur->filter_ctx, cur->pad_idx,

503 match->filter_ctx, match->pad_idx);

504 avfilter_inout_free(&match);

505 if (ret < 0)

506 goto fail;

507 }

508

509 fail:

510 if (ret < 0) {

511 while (graph->nb_filters)

512 avfilter_free(graph->filters[0]);

513 av_freep(&graph->filters);

514 }

515 avfilter_inout_free(&inputs);

516 avfilter_inout_free(&outputs);

517 avfilter_inout_free(&open_inputs);

518 avfilter_inout_free(&open_outputs);

519 return ret;

520 }

521

522 int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters,

523 AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,

524 void *log_ctx)

525 {

526 int index = 0, ret = 0;

527 char chr = 0;

528

529 AVFilterInOut *curr_inputs = NULL;

530 AVFilterInOut *open_inputs = open_inputs_ptr ? *open_inputs_ptr : NULL;

531 AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;

532

533 if ((ret = parse_sws_flags(&filters, graph)) < 0)

534 goto end;

535

536 do {

537 AVFilterContext *filter;

538 const char *filterchain = filters;

539 filters += strspn(filters, WHITESPACES);

540

541 if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)

542 goto end;

543

544 if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)

545 goto end;

546

547 if (filter->nb_inputs == 1 && !curr_inputs && !index) {

548 /* First input pad, assume it is "[in]" if not specified */

549 const char *tmp = "[in]";

550 if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)

551 goto end;

552 }

553

554 if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)

555 goto end;

556

557 if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,

558 log_ctx)) < 0)

559 goto end;

560

561 filters += strspn(filters, WHITESPACES);

562 chr = *filters++;

563

564 if (chr == ';' && curr_inputs) {

565 av_log(log_ctx, AV_LOG_ERROR,

566 "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",

567 filterchain);

568 ret = AVERROR(EINVAL);

569 goto end;

570 }

571 index++;

572 } while (chr == ',' || chr == ';');

573

574 if (chr) {

575 av_log(log_ctx, AV_LOG_ERROR,

576 "Unable to parse graph description substring: \"%s\"\n",

577 filters - 1);

578 ret = AVERROR(EINVAL);

579 goto end;

580 }

581

582 if (curr_inputs) {

583 /* Last output pad, assume it is "[out]" if not specified */

584 const char *tmp = "[out]";

585 if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,

586 log_ctx)) < 0)

587 goto end;

588 }

589

590 end:

591 /* clear open_in/outputs only if not passed as parameters */

592 if (open_inputs_ptr) *open_inputs_ptr = open_inputs;

593 else avfilter_inout_free(&open_inputs);

594 if (open_outputs_ptr) *open_outputs_ptr = open_outputs;

595 else avfilter_inout_free(&open_outputs);

596 avfilter_inout_free(&curr_inputs);

597

598 if (ret < 0) {

599 while (graph->nb_filters)

600 avfilter_free(graph->filters[0]);

601 av_freep(&graph->filters);

602 }

603 return ret;

604 }

AVFilterGraph::filters

AVFilterContext ** filters

Definition: avfilter.h:763

NULL

#define NULL

Definition: coverity.c:32

avfilter_free

void avfilter_free(AVFilterContext *filter)

Free a filter context.

Definition: avfilter.c:727

ctx

AVFormatContext * ctx

Definition: movenc-test.c:48

avfilter.h

Main libavfilter public API header.

mem.h

memory handling functions

avfilter_inout_free

void avfilter_inout_free(AVFilterInOut **inout)

Free the supplied list of AVFilterInOut and set *inout to NULL.

Definition: graphparser.c:187

AVFilterInOut::next

struct AVFilterInOut * next

next input/input in the list, NULL if this is the last

Definition: avfilter.h:947

AVS_Value

Definition: avisynth_c.h:462

avstring.h

AVFilterGraph::scale_sws_opts

char * scale_sws_opts

sws options to use for the auto-inserted scale filters

Definition: avfilter.h:766

avfilter_link

int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)

Link two filters together.

Definition: avfilter.c:131

end

static av_cold int end(AVCodecContext *avctx)

Definition: avrndec.c:90

filter

static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, uint8_t clip)

Definition: cfhd.c:82

insert_inout

static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)

Definition: graphparser.c:214

avfilter_graph_parse2

int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters, AVFilterInOut **inputs, AVFilterInOut **outputs)

Add a graph described by a string to a graph.

Definition: graphparser.c:391

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

parse_inputs

static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_outputs, void *log_ctx)

Definition: graphparser.c:280

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

extract_inout

static AVFilterInOut * extract_inout(const char *label, AVFilterInOut **links)

Definition: graphparser.c:197

AVERROR

#define AVERROR(e)

Definition: error.h:43

AVFilterContext::nb_outputs

unsigned nb_outputs

number of output pads

Definition: avfilter.h:317

av_strlcpy

size_t av_strlcpy(char *dst, const char *src, size_t size)

Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.

Definition: avstring.c:83

fail

#define fail()

Definition: checkasm.h:80

av_get_token

char * av_get_token(const char **buf, const char *term)

Unescape the given string until a non escaped terminating char, and return the token corresponding to...

Definition: avstring.c:149

avfilter_get_by_name

const AVFilter * avfilter_get_by_name(const char *name)

Get a filter definition matching the given name.

Definition: avfilter.c:506

av_asprintf

char * av_asprintf(const char *fmt,...)

Definition: avstring.c:113

AVFilterContext::nb_inputs

unsigned nb_inputs

number of input pads

Definition: avfilter.h:313

AVFilterGraph

Definition: avfilter.h:761

outputs

static const AVFilterPad outputs[]

Definition: af_afftfilt.c:385

src

#define src

Definition: vp9dsp.c:530

AVFilterInOut::filter_ctx

AVFilterContext * filter_ctx

filter context associated to this input/output

Definition: avfilter.h:941

avfilter_init_str

int avfilter_init_str(AVFilterContext *filter, const char *args)

Initialize a filter with the supplied parameters.

Definition: avfilter.c:889

AVFilterInOut

A linked-list of the inputs/outputs of the filter chain.

Definition: avfilter.h:936

inputs

static const AVFilterPad inputs[]

Definition: af_afftfilt.c:375

av_strdup

char * av_strdup(const char *s)

Duplicate the string s.

Definition: mem.c:267

parse_sws_flags

static int parse_sws_flags(const char **buf, AVFilterGraph *graph)

Definition: graphparser.c:368

append_inout

static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)

Definition: graphparser.c:220

buf

void * buf

Definition: avisynth_c.h:553

avfilter_graph_parse

int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, AVFilterInOut *open_inputs, AVFilterInOut *open_outputs, void *log_ctx)

Add a graph described by a string to a graph.

Definition: graphparser.c:459

AVFilter

Filter definition.

Definition: avfilter.h:141

index

int index

Definition: gxfenc.c:89

AVFilterInOut::pad_idx

int pad_idx

index of the filt_ctx pad to use for linking

Definition: avfilter.h:944

AVFilter::name

const char * name

Filter name.

Definition: avfilter.h:145

AVFilterGraph::nb_filters

unsigned nb_filters

Definition: avfilter.h:764

snprintf

#define snprintf

Definition: snprintf.h:34

parse_filter

static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph, int index, void *log_ctx)

Parse a string of the form FILTER_NAME[=PARAMS], and create a corresponding filter instance which is ...

Definition: graphparser.c:164

AVFilterInOut::name

char * name

unique name for this input/output in the list

Definition: avfilter.h:938

filt

static const int8_t filt[NUMTAPS]

Definition: af_earwax.c:39

parse_outputs

static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs, AVFilterInOut **open_inputs, AVFilterInOut **open_outputs, void *log_ctx)

Definition: graphparser.c:320

avfilter_inout_alloc

AVFilterInOut * avfilter_inout_alloc(void)

Allocate a single AVFilterInOut entry.

Definition: graphparser.c:182

create_filter

static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index, const char *filt_name, const char *args, void *log_ctx)

Create an instance of a filter, initialize and insert it in the filtergraph in *ctx.

Definition: graphparser.c:96

link_filter

static int link_filter(AVFilterContext *src, int srcpad, AVFilterContext *dst, int dstpad, void *log_ctx)

Link two filters together.

Definition: graphparser.c:37

av_free

#define av_free(p)

Definition: tableprint_vlc.h:34

avfilter_graph_alloc_filter

AVFilterContext * avfilter_graph_alloc_filter(AVFilterGraph *graph, const AVFilter *filter, const char *name)

Create a new filter instance in a filter graph.

Definition: avfiltergraph.c:172

filters

static const struct PPFilter filters[]

Definition: postprocess.c:137

opts

AVDictionary * opts

Definition: movenc-test.c:50

parse_link_name

static char * parse_link_name(const char **buf, void *log_ctx)

Parse the name of a link, which has the format "[linkname]".

Definition: graphparser.c:58

link_filter_inouts

static int link_filter_inouts(AVFilterContext *filt_ctx, AVFilterInOut **curr_inputs, AVFilterInOut **open_inputs, void *log_ctx)

Definition: graphparser.c:232

avfilter_graph_parse_ptr

int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters, AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr, void *log_ctx)

Add a graph described by a string to a graph.

Definition: graphparser.c:522

AVFilterContext

An instance of a filter.

Definition: avfilter.h:304

WHITESPACES

#define WHITESPACES

Definition: graphparser.c:30

av_freep

#define av_freep(p)

Definition: tableprint_vlc.h:35

start